There are ones that are monophasic (same pill for three weeks in a row) and ones that are tri-phasic (or other numbers, I suppose). There are also estrogen+progesteron synthetics or progesterin alone (estrogen alone? I don't know.). You might want to research this and suggest a certain kind to your physician (preferably a lower dose one).
Some are stronger than others.
If it is for just acne, I would look into other treatments first. It seems drastic to go on hormones just for acne.
But for the record- I have had pretty much only positive effects. It actually helps my depression, I have predictable, light periods, no PMS what so ever, larger on top, less acne, and I can't get pregnant (when used properly). But when first using it, it made me ill for a little while, and I generally gained weight, but it came off.
Plus, I have a lower risk of ovarian cancer. Research on increased breast and cervical cancer is mixed. A lot of people say many different things on increased cancer risk.